<p>A) mRNA levels of IGFR-1, IGFR-2, IGF1, and IGF2 increase with time in differentiating embryoid bodies measured from days 1–7, although IGF1 appears to remain steady, pointing to its role in both pluripotency and differentiation. * denotes P<0.05 to day 1 control, Rn denotes normalized reporter.</p>